#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion

using Grpc.Core;
using Grpc.Health.V1;
using NUnit.Framework;

namespace Grpc.HealthCheck.Tests;

/// <summary>
/// Health client talks to health server.
/// </summary>
public class HealthClientServerTest
{
    const string Host = "localhost";
    Server? server;
    Channel? channel;
    Grpc.Health.V1.Health.HealthClient? client;
    Grpc.HealthCheck.HealthServiceImpl? serviceImpl;

    [OneTimeSetUp]
    public void Init()
    {
        serviceImpl = new HealthServiceImpl();

        // Disable SO_REUSEPORT to prevent https://github.com/grpc/grpc/issues/10755
        server = new Server(new[] { new ChannelOption(ChannelOptions.SoReuseport, 0) })
        {
            Services = { Grpc.Health.V1.Health.BindService(serviceImpl) },
            Ports = { { Host, ServerPort.PickUnused, ServerCredentials.Insecure } }
        };
        server.Start();
        channel = new Channel(Host, server.Ports.Single().BoundPort, ChannelCredentials.Insecure);

        client = new Grpc.Health.V1.Health.HealthClient(channel);
    }

    [OneTimeTearDown]
    public void Cleanup()
    {
        channel?.ShutdownAsync().Wait();

        server?.ShutdownAsync().Wait();
    }

    [Test]
    public void ServiceIsRunning()
    {
        Assert.NotNull(serviceImpl);
        serviceImpl!.SetStatus("", HealthCheckResponse.Types.ServingStatus.Serving);

        Assert.NotNull(client);
        var response = client!.Check(new HealthCheckRequest { Service = "" });
        Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.Serving, response.Status);
    }

    [Test]
    public void ServiceDoesntExist()
    {
        Assert.NotNull(client);
        var ex = Assert.Throws<RpcException>(() => client!.Check(new HealthCheckRequest { Service = "nonexistent.service" }))!;
        Assert.AreEqual(StatusCode.NotFound, ex.Status.StatusCode);
    }

    // TODO(jtattermusch): add test with timeout once timeouts are supported
}
